Knife rack



FIG. 1 is a perspective view of a knife rack showing our new design;

FIG. 2 is a side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a front elevational view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a back elevational view. 

The ornamental design for a knife rack, substantially as shown. 